Malfunctions of the idle speed regulator of the automobile engine
Encyclopedia of radio electronics and electrical engineering /
Automobile. Electronic fuel injection
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Photo 1 shows the idle speed controller disassembled. Immediately make a reservation that the disassembly of the IAC should be done with some caution. Otherwise, there is a high probability of permanently disabling it. In order to disassemble the IAC, you need to remove three fixing pins from its body. After that, with a little effort, remove the connector housing so as not to damage the wires and their soldering.
One of the malfunctions that I had to deal with was an internal wire break (see photo-2).
After soldering the conductor detached from the contact, the normal operation of the IAC was restored. It should be noted that the place of soldering after repair should be washed with alcohol and varnished in order to further exclude possible corrosion of this contact. Alas, this is perhaps the simplest malfunction of the idle speed controller, which is easy to fix without any problems. It is much more difficult to deal with other malfunctions and most often the IAC must be replaced with a new one. These malfunctions include the development of guides for the conical needle and / or its drive. There are special grooves on the conical needle that enter the guide bushings (see photos 3 and 4).
The guides of this bushing tend to wear out. As a result, the conical needle begins to rotate in this sleeve, which makes it impossible to move the needle forward. Accordingly, the normal operation of the engine at idle is disrupted, because. it is with these translational movements that the cone needle opens or closes the additional air supply channel bypassing the closed throttle valve. The development of a conical needle drive leads to a similar situation. Unfortunately, I was not able to take high-quality photos with my camera due to focusing problems.
In conclusion, it should be recalled that before installing the IAC in its place, it is necessary to correctly set the initial position of the conical needle. There should be 23mm between the IAC flange and the end point of the needle (see photo 5).
This gap is necessary so that when installing the IAC, its conical needle cannot rest against the seat on the throttle body. The gap is set using a special multi-tester or a control pulse shaper for the idle speed controller. In addition, the O-ring on the IAC mounting flange should be lubricated with engine oil. Installation and connection of the idle speed controller connector should be carried out with the ignition off.
Publication: cxem.net
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Automobile. Electronic fuel injection
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